Kali ini kita akan membuat saklar otomatis berbasis WiFi dikendalikan melalui internet yang bisa digunakan untuk mengontrol 4 peralatan elektronik seperti lampu, kipas angin TV dan lain-lain, cukup dikontrol melalui handphone bisa kapan saja dan dimana saja.
Bagi agan-agan yang baru mengenal elektronik dan ingin belajar, terutama latihan menyolder komponen dasar ke papan PCB. Bisa coba Soldering Kit Robadge#1, selain bisa sebagai sarana latihan menyolder, Kit ini juga bentuknya lucu dan berfungsi sebagai rangkaian Flip-Flop (lampu LED kedap-kedip) yang bisa agan-agan pasang jadi bross menyala dibaju.
Hai agan-agan sekalian, dalam tutorial kali ini ane akan menunjukan bagaimana cara Arduino Uno kamu supaya bisa diprogram menggunakan HP Android tanpa kabel alias lewat bluetooth. Caranya sangat mudah sekali, mari kita mulai saja! :)
/* Bluino Starter Shield
Latihan 08 Membunyikan Buzzer
This sketch uses the buzzer to play songs.
The Arduino's tone() command will play notes of a given frequency.
Version 1.0 9/2017 MK
*/
const int buzzerPin = A3; // connect the buzzer to pin A3
const int songLength = 18; // sets the number of notes of the song
// Notes is an array of text characters corresponding to the notes
// in your song. A space represents a rest (no tone)
char notes[songLength] = {
'c', 'd', 'f', 'd', 'a', ' ', 'a', 'g', ' ', 'c', 'd', 'f', 'd', 'g', ' ', 'g', 'f', ' '};
// beats[] is an array of values for each note. A "1" represents a quarter-note,
// "2" a half-note, and "4" a quarter-note.
// Don't forget that the rests (spaces) need a length as well.
int beats[songLength] = {
1, 1, 1, 1, 1, 1, 4, 4, 2, 1, 1, 1, 1, 1, 1, 4, 4, 2};
int tempo = 113; // The tempo is how fast to play the song (beats per second).
void setup() {
pinMode(buzzerPin, OUTPUT); // sets the buzzer pin as an OUTPUT
}
void loop() {
int i, duration; //
for (i = 0; i < songLength; i++) { // for loop is used to index through the arrays
duration = beats[i] * tempo; // length of note/rest in ms
if (notes[i] == ' ') // is this a rest?
delay(duration); // then pause for a moment
else { // otherwise, play the note
tone(buzzerPin, frequency(notes[i]), duration);
delay(duration); // wait for tone to finish
}
delay(tempo/10); // brief pause between notes
}
}
int frequency(char note) {
int i;
const int numNotes = 8; // number of notes we're storing
char names[numNotes] = {
'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C' };
int frequencies[numNotes] = {
262, 294, 330, 349, 392, 440, 494, 523 };
// Now we'll search through the letters in the array, and if
// we find it, we'll return the frequency for that note.
for (i = 0; i < numNotes; i++) { // Step through the notes
if (names[i] == note) { // Is this the one?
return(frequencies[i]); // Yes! Return the frequency and exit function.
}
}
return(0); // We looked through everything and didn't find it,
// but we still need to return a value, so return 0.
}
char notes[] = "cdfda ag cdfdg gf ";
char names[] = {'c','d','e','f','g','a','b','C'};
tone(pin, frequency, duration);tone(). Fungsi ini akan mengelhasilkan frekuensi tertentu pada pin output, memjadikan fungsi ini sangat berguna untuk membunyikan sebuah buzzer atau speaker. Jika kamu memberi nilai untuk durasi (dalm milidetik), maka nada akan berbunyi dan kemudian berhenti. Jika tidak diberikan nilai durasi maka nada akan berbunyi terus menerus, namun kamu masih dapat menghentikannya menggunkan fungsi noTone(). 
/* Bluino Starter Shield
Latihan 10 Mengendalikan Relay
A relay is a electrically-controlled mechanical switch. It has an
electro-magnetic coil that either opens or closes a switch.
Version 1.0 9/2017 MK
*/
const int relayPin = 12; // This pin drives the transistor (which drives the relay)
const int timeDelay = 1000; // delay in ms for on and off phases
// You can make timeDelay shorter, but note that relays, being
// mechanical devices, will wear out quickly if you try to drive them too fast.
void setup() {
pinMode(relayPin, OUTPUT); // set pin as an output
}
void loop() {
digitalWrite(relayPin, HIGH); // turn the relay on
delay(timeDelay); // wait for one second
digitalWrite(relayPin, LOW); // turn the relay off
delay(timeDelay); // wait for one second
}digitalWrite(relayPin, HIGH);digitalWrite(relayPin, LOW);
